202 million km (1.35 AU or 125 million miles) from Earth an explorer from Earth is investigating the giant asteroid Vesta. This intrepid pioneer is the Dawn space probe.

image of vesta craters

Vesta's heavily cratered surface (Image credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA)


Orbiting about 2700 km (1700 miles) above Vesta, Dawn slowly rotates around the world beneath it. Every 69 hours, the spacecraft completes a circuit (meanwhile Vesta is rotating beneath, a day there is only five hours 20 minutes long).  As Dawn follows its course, it passes north to south over the asteroid’s poles. As it passes over the dayside the spacecraft observes the illuminated surface, recording what it sees, then on the other half of its orbit as it passes over the nightside, the robotic explorer transmits its findings to distant Earth. Data transmitted by radio from Dawn takes 11 minutes to reach home.

NASA has just released a fascinating new animation showing the whole asteroid as it rotates beneath Dawn.

The Dawn spacecraft will continue orbiting the giant asteroid for a year, before departing for the dwarf planet Ceres.  Dawn will reach Ceres in 2015, revealing the mysteries of its icy surface.

1 Comment

Was NASA Technology Predicted in Ancient Indian Writings? | Astronotes · May 28, 2014 at 14:39

[…] was launched in 2007 and travelled towards the asteroid belt using ion propulsion engines visiting Vesta. It is intended to reach the dwarf planet Ceres located in the asteroid belt in February of 2015. […]

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